F3/F4 close with reviewer_confirm kind:'phase' (they do NOT auto-advance); advance:true only auto-advances F2-empty/F6-skip; rewrite_question belongs to F3 not F1; F4 uses the new write_schema_linking tool with the documented SchemaLinking shape. Adds a per-phase artifact/close cheat-sheet. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>